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A shallow lake can be considered a CFSTR. Nitrification, the conversion of ammonia to nitrate (NH3 -> NO3-) occurs in the lake according to first - order kinetics. One stream feeds the lake and one stream empties the lake with the flow rate in both being 8 cfs. If the first - order decay coefficient is 0.02 day-1, the influent ammonia concentration is 3.5 mg/L and effluent ammonia concentration is 0.25 mg/L, what is the volume of the lake in cubic feet?
Calculate the pressure, and the piezometric head at the free surface, at both interfaces, and at the tank bottom. Take the elevation datum at the bottom of the tank.
If clean groundwater flows through an aquifer contaminated with a dense non- aqueous phase liquid (DNAPL), calculate the concentration of DNAPL in the water as a function of time if the DNAPL is dissolving into the water at a rate of k1
The velocity of a particle traveling along a straight line is v=(3t^2-6t) ft/s , where t is in seconds. if s=4ft when t=0 determine the position of the particle when t=4s what is the total distance during the time interval t=0 to t=4s
Identical bricks 0.1m wide, and weighting 2kg are placed on a plate (assume the plate has neligible weight). Calculate the total weight (and force F required to balance the plate).
The center of gravity G of the 20-in. club is located 12 in. from the knob. knowing that at the instant, G has a velocity of 4 ft/s upwards and the club has an angular velocity of 30 rad/s counterclockwise
Choose a pipe to be used as a tension member to resist a service dead load of 10 kips and a service live load of 25 kips. The ends will be connected by welding completely around the circumference of the pipe.
Draw the shear and moment Diagram for a beam that is 10 feet long, supported on the left end by a roler, and the right end by a pin, and has a 1000 lb load placed in the center i.e at 5 feet.
Draw the FBD and the shear and bending moment diagrams. Label all minimums, maximums and zero crossing points as well as the slopes as constant, linear or parabolic.
How much of a reduction in the automobile emission rate would be required to achieve the maximum eight-hour average NAAQS for CO at steady state 9ppmv (10.3 mg/m3)?
Determine the magnitudes of the additional loads that must be applied at B and F if the resultant of all six loads is to pass through the center of the mat.
An absorption column is to be designed to recover 99.5% of the NH3 from a feed stream, which is supplied at 72 F and an NH3 partial pressure of 10 mm Hg. The feed stream contains 2100 lbm/hr of air.
Design a cord (design the constants k and ) so the cord stretches 2.5 times the unstretched length, and the acceleration of the jumper doesn't exceed 3g, and the cord has zero stiffness at the bottom of a 400ft drop.
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